EPR-00015 Datasheet, PDF (9/24 Pages) Power Integrations, Inc. – 3W, Universal Input, Single Output, Isolated Converter with TNY254 (EP-15)

Engineering Prototype Report
7.2 Transformer Spreadsheet
The use of RC snubber across U1 limits the choice of operation to discontinuous only.
ACDC_TNY_Rev2.02_100899
INPUT INFO OUTPUT UNIT
ACDC_TNY_REV2_02_100899.xls: TinySwitch
Copyright Power Integrations Inc.
Continuous/Discontinuous Flyback Transformer
1999
Design Spreadsheet
ENTER APPLICATION VARIABLES
Customer
VACMIN
85
Volts
Minimum AC Input Voltage
VACMAX
fL
VO
PO
n
Z
tC
CIN
MODE OF OPERATION
Continuous ('c') or Discontinuous ('d') ?
265
50
12
3
0.75
0.5
3
9.4
d
Fully Discontinuous ('y') ?
n ^{Mostly Disc.}
ENTER TinySwitch Parameters
TinySwitch
ILIMITmin
ILIMITmax
fSmin
VDS
ENTER Output Diode Parameters
Output Diode
VR
ID
VD
k
tny254
40000.00
10
Universal
4W
0.23
0.28
40000
200
1
1
0.8
ENTER Other Parameters
BP
Design Parameters
VMIN
VMAX
IP
DMAX
KDP
2500
1.00
Volts
Hertz
Volts
Watts
mSeconds
uFarads
Maximum AC Input Voltage
AC Mains Frequency
Output Voltage
Output Power
Efficiency Estimate
Loss Allocation Factor
Bridge Rectifier Conduction Time Estimate
Input Filter Capacitor
Continuous mode operation or Discontinuous mode
operation?
Need Discontinuous mode operation guaranteed in all
conditions?
115/230Vac
5W
Amps
Minimum current limit
Amps
Maximum current limit
Hertz
Minimum Frequency
Volts
Voltage drop between Drain to Source
Volts
Amps
Volts
Gauss
92 Volts
375 Volts
0.21 Amps
0.419
1.00
Diode Maximum Peak Repetitive Reverse Voltage
Diode Average Forward Current
Diode Forward Voltage drop
Diode Ipk to Irms factor (k=0.9 for Schottky, k=0.8 for PN
diode, k=0.2 TNY256)
Target Peak Flux Density at Maximum Current limit
Minimum DC Input Voltage
Maximum DC Input Voltage
Peak Primary current
Duty Cycle at minimum DC input Voltage
VOR
VDRAIN
PIVS
LP
59.34 _Volts
513.77 Volts
94 Volts
3676 uHenries
Reflected Output Voltage
Maximum Drain Voltage Estimate
Output Rectifier Peak Inverse Voltage
Minimum Primary Inductance
ENTER TRANSFORMER CORE/CONSTRUCTION
Core Type
ee16
Glass Bead Construction (y/n)
y
AE
LE
AL
BW
M
0
NP
NS
Glass_Bead_Diameter
EE16
0.192
3.5
1140
8.5
cm^2
cm
nH/T^2
mm
mm
223 Turns
49 Turns
0.249 mm
Glass Beads Construction Chosen
Core Effective Cross Sectional Area
Core Effective Path Length
Ungapped Core Effective Inductance
Bobbin Physical Winding Width
Safety Margin Width
Primary Winding Number of Turns
Number of Secondary Turns
Glass Bead Diameter (mm)
EPR-00015
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